Improvement in sectiomai boilers



B-. T. BA-B BlTT.

Sectional-Boiler.

Patented Aug. 31,1875.

IIIIIIIII/ ".PETERS. FHOTO-LJTMDGMPNEN, WASHINGTON, D. C

Unrrnn S'ra'rns ATENT @rrrca BENJAMIN T. BABBITI, OF NEW YORK, N. Y.

IMPROVEMENT IN SECTIONA L BOILERS.

Specification forming partof Letters Patent No. 1697.292, dated August31, 1875; application filed June 23, 1875.

To all whom it may concern:

Be it known that I, BENJAMIN T. BABBITT, of the city, county, and Stateof New York, have invented a new and useful Improvement inSteam-Boilers; and I do hereby declare that the following is a full,clear, and exact description of the same, reference being had to theaccompanying drawing, which forms part of this specification.

This invention consists in certain combinations of tubes, lines, andpassages, applied to a vertical steam-boiler, whereby a most ellicientand economical heating-surface is obtained for the rapid production ofsteam; also hot air freely supplied to the furnace of the boiler, andthe whole made to combine great compactness with strength.

In the accompanying drawing, Figure 1 represents a vertical section of asteam-boiler having my invention applied; and Fig. 2 a horizontalsection on the line m 00.

A is the outer case of the boiler, which is cylindrical. is acylindrical chamber, B, which forms the water-space ofthe boiler, andwhich is stocked or provided with upright smoke-tubes 0, arranged toestablish communication between the lire-chamber D, through thecrown-sheet b, and an upper cylindrical smoke-box, E, of somewhat lessdiameter than the chamber B, so as to leave an annular space, 0, aroundsaid smoke-box, for the escape of steam from the chamber B into a drumor cylindrical cham' -ber, F, from whence the steam may be drawn off asrequired. The crown-sheet of this steam drum or chamber F extends acrossthe chamber B, leaving a second or upper smoke chamber, G, in the upperpart of the chamber B, and which smoke-chamber is in free communication,by a neck or passage, (1, with the smokebox E below it. H is thefire-grate, and I the feed-opening ot' the fire-place D. J is theash-pit, and Kthe Smokestack or chimney.

The products of combustion escape from the upper smoke-chamber Grthrough upper lateral distributing-apertures f, into an annular jacket,L, which is composed of the space lying between the outer case or shellA and the cylinder 13. The products of combustion thus admitted to andaround the cylinder B pass down said annular jacket L, which actsCentrally within this outer caseas a return-flue, and ultimately passout through lower lateral distributing-apertures f into a lowerhorizontal flue, M, on the outside of the case A, and from thence intothe'chimney K.

N N are air-heating tubes, made to project down within the annularjacket L, and connecting the ash-pit J with the air-space above theboiler. Said tubes may form acontinuous annular cluster around thecylinder B, and, where the fuel-feed opening I- occurs, may connect witha passage, h, outside of or inclosing the top and sides of said openingor fuel-way, and the passage h be made to communicate at its bottom withthe ash-pit. The other tubes N directly connect with the ashpit.

A vertical boiler, constructed as described,

not only combines compactness with strength,

but is exceedingly economical as regards its consumption of fuel, andgenerates steam rapidly. Thus, the boiler-furnace or ash pit thereof iscopiously supplied with well-distributed columns of air descendingwithin the tubes N, and which are highly heated before reaching theash-pit by reason of the exposure of said tubes to the products ofcombustion within the annular jacket L, and radiation from the cylinderB, thus promoting combustion by supplying the furnace with hot air whichis introduced in a distributed manner to'the ash-pit. A very large andefficient fire or heating surface is also provided for the boiler byreason of the interior smoke fines or tubes 0, the smoke-chambers E G,having the steam drum or space F in between them, and the outside returnflue or jacket L. This combination not only efl'ects a most perfectutilization of the products of combustion, but loss of heat by outsideradiation 'from the boiler proper is prevented.

I claim- The air-heating tubes N, in combination with the annular jacketor return flue L, the cylinder B, with its direct smoke tubes or lines0, the outer case A, and the ash-pit J, essentially as shown anddescribed.

13. T. BABBITT. Witnesses:

EDWARD It. BARTON, E. J. GmBoNs.

